Bump psutil from 5.6.5 to 5.6.6

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.6.5 to 5.6.6.
- [Release notes](https://github.com/giampaolo/psutil/releases)
- [Changelog](https://github.com/giampaolo/psutil/blob/master/HISTORY.rst)
- [Commits](giampaolo/psutil@release-5.6.5...release-5.6.6)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,7 +1,7 @@
 boto3==1.10.14
 Jinja2==2.10.3
 jmespath==0.9.4
-psutil==5.6.5
+psutil==5.6.6
 PyYAML==5.1.2
 mock==3.0.5
 nose